Rewterz Threat Alert – REvil Ransomware – Active IOCs

Severity

High

Analysis Summary

The REvil (also known as Sodinokibi) is a Ransomware-as-a-Service (RaaS). The first attack of REvil in middle of April 2019, and attracted huge attention span from the InfoSec world due to their uncanny similarities with GandCrab Ransomware. The group uses different distribution techniques of deploying ransomware such as exploit kits, scans and exploiting various vulnerable software (Oracle WebLogic), RDP servers, and backdoored software installers. Revil has made estimated over $100 million by infecting large business owners and they threaten to publish data if the ransom money is not paid by the victim. 

The ransom note placed by REvil (Source: Elliptic)

Impact

• File Encryption

Indicators of Compromise

MD5

• 0e285f30f30dedd812295d2408f4b84c

SHA-256

• d91f951bdcf35012ac6b47c28cf32ec143e4269243d8c229f6cb326fd343df95

SHA-1

• 24e8a7a0b9fdf929e6cc4b52b0470bf4f7b6f244

Remediation

• Block all threat indicators at your respective controls.
• Search for Indicator of compromise (IOCs) in your environment utilizing your respective security controls.
• Maintain cyber hygiene by updating your anti-virus software and implement patch management lifecycle.
• Maintain Offline Backups – In a ransomware attack, the adversary will often delete or encrypt backups if they have access to them. That’s why it’s important to keep offline (preferably off-site), encrypted backups of data and test them regularly.
• Emails from unknown senders should always be treated with caution.
• Never trust or open ” links and attachments received from unknown sources/senders.